package io;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class CopyDemo2 {
    public static void main(String[] args) throws IOException {
        //块读写
        FileInputStream fis = new FileInputStream("./123.jpg");
        FileOutputStream fos = new FileOutputStream("./123_cp2.jpg");
        int len;
        byte[] data = new byte[1024 * 10];//10kb
        long start = System.currentTimeMillis();
        while ((len = fis.read(data)) != -1) {
            fos.write(data,0,len);
        }
        long end = System.currentTimeMillis();
        System.out.println("复制完毕，用时：" + (end - start)+ "ms");

    }
}
